Re: valarray_copy implementation question

[Christian BRUEL <christian dot bruel at st dot com>]

The case I have is for SH4. I'll try to reduce and reproduce on x86.

However, reading the code, the scenario is easy to describe. I you have 
a bool Array with only false value the while (! *__ok) loop while go 
forever. so a check on the count is needed.

As an illustration, the code could be rewritten as

      _Tp* __q (__b._M_data);
      bool* __ok (__m._M_data);
      for (_Tp* __p = __a._M_data; __p < __a._M_data+__n;
	   ++__p, ++__ok, ++__q)
	{
	  if (*__ok)
              *__q = *__p;
	}

but that implies that the size if each array is __n, which is not 
apparently the original Standard interpretation.

Best Regards

Christian

Paolo Carlini wrote:
> Gabriel Dos Reis wrote:
> > I did not consider the interpretation put forward by Christian, although I can
> > see his point.  I suspect I have to  double-check what Fortran
> > does in this case and consider whether it actually is a LWG issue.
> >   
> Thanks Gaby for your help.
> > Do you know what other implementations do?
> >   
> I can check another one. If you can pass me a precise testcase, then I
> can give you the data point.
>
> Paolo.